Science
(a) What is the fundamental difference between hypermetropia and myopia in terms of the optical experience of a person?
(b) The diagram below shows a special case of an eye defect.
(i) What is the defect that is shown in the figure?
(ii) State one cause for such a defect?
(iii) Explain with reason if a concave lens can be used to correct the defect.
Human Eye
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Answer
(a) Hypermetropia is a defect that causes difficulty in focusing on near objects, with clearer vision observed for distant objects while, in Myopia distant objects appear blurry while near objects are seen clearly.
(b)
(i) The diagram shows that light rays from a nearby object are converging behind the retina hence, the defect is Hypermetropia (long-sightedness).
(ii) One cause of hypermetropia is shortening of the eye ball.
(iii) No, a concave lens would diverge the rays entering the eye and make the image form further away from the retina. A convex lens should be used instead, as it converges the rays and helps to form the image exactly on the retina.
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